It's basically looks like a glorified rectangular shed but it does have sewage, electric, water, and hvac. Not very impressive but every single person I've had over who's lived in an apartment has expressed interest in learning how to do the same over paying rent out the ass for a similarly sized uninspiring shit-box and ending up with no equity.

The only people that have been over that have been unimpressed are people already living in an actual house, but that's not really the target audience for this kind of thing.

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I speculated on an old well share that turned out to be good, so got a well for basically nothing. If you don't have such luck you can haul water.

I use septic, which in some counties (mine) no requirement you be licensed to build. It can be built with only a shovel and some pipes and concrete if you are on an extreme budget, although helps a lot more if you can get ahold of an excavator.